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Simon Singh's NumbersFive NumbersEpisodes

    Infinity

    Georg Cantor defined infinity as the size of the never-ending list of counting numbers.

    The Imaginary Number

    If the square root of +1 is both +1 and -1, then what is the square root of -1?

    The Golden Ratio

    The ratio of consecutive numbers in the Fibonacci is close to 1.618, the Golden Ratio.

    Pi

    At its simplest, Pi is the ratio of the circumference of a circle to its diameter.

    Zero

    Strangely, 'nothing' had to be invented, and then it took thousands of years to catch on.